'v' Wave in JVP is due to ?

Ans. is 'd' i.e., Closure of tricuspid valve. The jugular venous pressure (JVP, sometimes referred to as jugular venous pulse) is the indirectly observed pressure over the venous system visualization of the internal jugular vein. The jugular venous pulsation has a biphasic waveform.The " a " wave corresponds to right Atrial contraction and ends synchronously with the carotid aery pulse. The peak of the 'a' wave demarcates the end of atrial systole.The " c " wave corresponds to right ventricular Contraction causing the triCuspid valve to bulge towards the right atrium.The " x' " (x prime) descent follows the 'c' wave and occurs as a result of the right ventricle pulling the tricuspid valve downward during ventricular systole. (As stroke volume is ejected, the ventricle takes up less space in pericardium, allowing relaXed atrium to enlarge). The x' (x prime) descent can be used as a measure of right ventricle contractility.The " x " descent follows the 'a' wave and corresponds to atrial relaXation and rapid atrial filling due to low pressure.The " v " wave corresponds to Venous filling when the tricuspid valve is closed and venous pressure increases from venous return - this occurs during and following the carotid pulse.The " y " descent corresponds to the rapid emptYing of the atrium into the ventricle following the opening of the tricuspid valve.